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post #1 of 4 (permalink) Old 09-05-2019, 02:27 PM Thread Starter
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New issue

I have a 03 400. It runs and drives fine. I have read all the cold start valve issues. This issue seems different. It doesnít want to cold start ever unless I tilt it on two wheels on its side and then back onto its four wheels. Fires right up then. Ideas?
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post #2 of 4 (permalink) Old 09-05-2019, 03:51 PM
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Sounds like a fuel delivery problem. Cleaned carb? Replaced petcok? Float adjusted correctly?

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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post #3 of 4 (permalink) Old 09-05-2019, 04:12 PM Thread Starter
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I havenít done anything other then run a can of sea foam through it. The previous owner did tell me it needed a new petcok but said only because it wonít shut the fuel off. Think the petcok could be the culprit.
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post #4 of 4 (permalink) Old 09-06-2019, 02:28 PM
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Replace it with one from a raptor660. Get the actual Yamaha part, not the Chinese Ebay knockoffs. Then youíll have an off setting. Just need to plug the vacuum line that goes to the stock carb.

I would still take the carb bowl off and clean out the Jets.

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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